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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bedf720fd650a5861ff2fbaa4157f5070ac3c619af134d62d2e787eadeaca02' 
  AND token = 'B+lf80RYonJHKRFoOoU9dn9IRHf7B5Or426DomuyAeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}